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Three people were killed in floodwaters from a strong storm that pounded Australia's east coast over the weekend, with drenching rains and huge ocean swells forcing some coastal residents to flee their homes and sending a swimming pool sliding into the sea.

The body of a 65-year-old man was found in a car today in a creek near the town of Bowral, about 120km south of Sydney, while the body of another man was found in a truck washed away by floodwaters in the southwest Sydney suburb of Leppington, New South Wales, state police said.

In the nation's capital, Canberra, a 37-year-old man died after powerful floodwaters flipped his truck over and swept it away.

The storm whipped up waves as high as 12 metres which caused severe beach erosion and forced hundreds of coastal residents to evacuate. .

Power was knocked out to more than 85,000 homes and businesses over the weekend. Nearly 300 people needed to be rescued from flooded areas across New South Wales, the state emergency services agency said. Many of those people had attempted to drive or walk across flooded roads.

There will be little reprieve for the homes teetering on the brink of the ocean on Sydney's northern beaches with another king tide as high as the last predicted tonight.

Meteorologist Phil Perkins said the weather bureau was expecting the next king tide to peak about 9pm (AEST) tonight "with a main window of threat" between 6pm and midnight.

It will follow "the biggest king tide of the year" which joined forces with the east coast low-pressure system and created huge seas which swept away the yards of multi-million-dollar beachfront homes on Collaroy and Narrabeen beaches.

The Massive storm and huge swells have knocked parts of these houses and a pool halfway into the ocean at Coloroy beach on Sydneys northern beaches. Photo / Daily Mail Australia

The Massive storm and huge swells have knocked parts of these houses and a pool halfway into the ocean at Coloroy beach on Sydneys northern beaches. Photo / Daily Mail Australia

"It's the worst I've seen it here ... I have never seen it come up this high with this amount of storm surge and I've been living here about 40 years," he told the ABC. "It's pretty much a disaster zone."

Mr Perkins told news.com.au Sydney, including the northern beaches, was expected to experience "light rain" this afternoon but said the worst of the strong winds and heavy rainfall was "behind us".

But the fallout and continued threat to homes was far from over.

A number of sinkholes have now opened up along the coastline threatening more damage to homes. Emergency crews are on site trying to save the beachfront properties.

Local resident David told the ABC: "There is no beach at Collaroy," he said.